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# How to work out the magnification using scale bar? watch

1. The scale bar says its 10mm, measured the length of the bar which was 26mm. I measured the figure image which was 73mm. Do I do 26/10 and then do 73/2.6? The teacher kind of rushed scale bars :/
2. Sorry you've not had any responses about this. Are you sure you’ve posted in the right place? Posting in the specific Study Help forum should help get responses.

I'm going to quote in Tank Girl now so she can move your thread to the right place if it's needed.

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3. (Original post by charlotteeeeej)
The scale bar says its 10mm, measured the length of the bar which was 26mm. I measured the figure image which was 73mm. Do I do 26/10 and then do 73/2.6? The teacher kind of rushed scale bars :/
magnification = image size / actual size

So, 26mm / 10mm = 2.6 x magnification

so to get the actual size of the image, 73mm / 2.6 = 28mm real size

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